1
2
3
4	K	Ca		Ga	Ge	As	Se	Br	Kr
5	Rb	Sr		In	Sn	Sb	Te	I	Xe
6	Cs	Ba		Tl	Pb	Bi	Po	At	Rn
7	Fr	Ra

Notes;

•  The chart above only show valence electrons for elements 1-18.  The rest follow the same pattern.
•  The "N" above is for nucleus and contains the appropriate number of Protons and Neutrons
•  Enegy level or row number is how many energy levels there are in an atom.
•  Column numbers are how many valance electrons an atom has.
•  Valence electrons are the electrons that react and form bonds with other atoms.
•  Row numbers are how many energy levels an atom has.  This makes the atoms bigger, heavier and more reactive. Inner energy levels are assumed "full".
•  Two electrons can fill the first energy level. Eight electrons fill the 2nd and 3rd levels.
•  All atoms want to have their outer energy levels full and will by reacting / combining with other elements.
•  The atoms in column 18 have full shells and do not react

If you are ready to learn more, and more details than this, go here; http://www.colorado.edu/physics/2000/periodic_table/valence_electrons.html